21850603 has 2 divisors, whose sum is σ = 21850604. Its totient is φ = 21850602.

The previous prime is 21850597. The next prime is 21850607. The reversal of 21850603 is 30605812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21850603 - 2²¹ = 19753451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21850607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10925301 + 10925302.

It is an arithmetic number, because the mean of its divisors is an integer number (10925302).

Almost surely, 2^21850603 is an apocalyptic number.

21850603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21850603 is an equidigital number, since it uses as much as digits as its factorization.

21850603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21850603 is about 4674.4628568425. The cubic root of 21850603 is about 279.5682248277.

The spelling of 21850603 in words is "twenty-one million, eight hundred fifty thousand, six hundred three".